Added the PopupBrowser2 demo for Linux

Set the CEFLinkedWindowParent1.TabStop to true to fix a focus issue
Moved TCEFLinkedWindowParent.UpdateSize to the public section

demos/Lazarus_Linux/TabbedBrowser2/TabbedBrowser2.lps

@@ -39,13 +39,13 @@
         <ResourceBaseClass Value="Frame"/>
         <IsVisibleTab Value="True"/>
         <EditorIndex Value="3"/>
-        <TopLine Value="118"/>
-        <CursorPos X="16" Y="145"/>
+        <TopLine Value="442"/>
+        <CursorPos X="6" Y="440"/>
         <UsageCount Value="24"/>
         <Bookmarks Count="3">
-          <Item0 X="22" Y="471" ID="2"/>
-          <Item1 X="50" Y="392" ID="3"/>
-          <Item2 X="36" Y="415" ID="4"/>
+          <Item0 X="22" Y="477" ID="2"/>
+          <Item1 X="50" Y="397" ID="3"/>
+          <Item2 X="36" Y="420" ID="4"/>
         </Bookmarks>
         <Loaded Value="True"/>
         <LoadedDesigner Value="True"/>
@@ -125,123 +125,127 @@
     <OtherDefines Count="1">
       <Define0 Value="UseCThreads"/>
     </OtherDefines>
-    <JumpHistory Count="29" HistoryIndex="28">
+    <JumpHistory Count="30" HistoryIndex="29">
       <Position1>
-        <Filename Value="uBrowserFrame.pas"/>
-        <Caret Line="124" Column="17" TopLine="103"/>
-      </Position1>
-      <Position2>
-        <Filename Value="uBrowserFrame.pas"/>
-        <Caret Line="463" Column="3" TopLine="436"/>
-      </Position2>
-      <Position3>
         <Filename Value="uBrowserTab.pas"/>
         <Caret Line="117" Column="67" TopLine="84"/>
+      </Position1>
+      <Position2>
+        <Filename Value="uBrowserTab.pas"/>
+        <Caret Line="128" Column="61" TopLine="103"/>
+      </Position2>
+      <Position3>
+        <Filename Value="uBrowserFrame.pas"/>
+        <Caret Line="144" Column="19" TopLine="123"/>
       </Position3>
       <Position4>
         <Filename Value="uBrowserTab.pas"/>
-        <Caret Line="128" Column="61" TopLine="103"/>
+        <Caret Line="133" Column="90" TopLine="103"/>
       </Position4>
       <Position5>
-        <Filename Value="uBrowserFrame.pas"/>
-        <Caret Line="144" Column="19" TopLine="123"/>
+        <Filename Value="uBrowserTab.pas"/>
+        <Caret Line="61" Column="67" TopLine="39"/>
       </Position5>
       <Position6>
         <Filename Value="uBrowserTab.pas"/>
-        <Caret Line="133" Column="90" TopLine="103"/>
+        <Caret Line="131" Column="41" TopLine="103"/>
       </Position6>
       <Position7>
         <Filename Value="uBrowserTab.pas"/>
-        <Caret Line="61" Column="67" TopLine="39"/>
+        <Caret Line="61" Column="19" TopLine="39"/>
       </Position7>
       <Position8>
         <Filename Value="uBrowserTab.pas"/>
-        <Caret Line="131" Column="41" TopLine="103"/>
+        <Caret Line="126" Column="42" TopLine="103"/>
       </Position8>
       <Position9>
-        <Filename Value="uBrowserTab.pas"/>
-        <Caret Line="61" Column="19" TopLine="39"/>
-      </Position9>
-      <Position10>
-        <Filename Value="uBrowserTab.pas"/>
-        <Caret Line="126" Column="42" TopLine="103"/>
-      </Position10>
-      <Position11>
         <Filename Value="uBrowserFrame.pas"/>
         <Caret Line="144" Column="19" TopLine="90"/>
+      </Position9>
+      <Position10>
+        <Filename Value="uMainForm.pas"/>
+        <Caret Line="96" Column="28" TopLine="86"/>
+      </Position10>
+      <Position11>
+        <Filename Value="uMainForm.pas"/>
+        <Caret Line="264" Column="38" TopLine="240"/>
       </Position11>
       <Position12>
         <Filename Value="uMainForm.pas"/>
-        <Caret Line="96" Column="28" TopLine="86"/>
+        <Caret Line="87" Column="15" TopLine="71"/>
       </Position12>
       <Position13>
         <Filename Value="uMainForm.pas"/>
-        <Caret Line="264" Column="38" TopLine="240"/>
+        <Caret Line="262" Column="75" TopLine="240"/>
       </Position13>
       <Position14>
         <Filename Value="uMainForm.pas"/>
-        <Caret Line="87" Column="15" TopLine="71"/>
+        <Caret Line="303" Column="41" TopLine="261"/>
       </Position14>
       <Position15>
         <Filename Value="uMainForm.pas"/>
-        <Caret Line="262" Column="75" TopLine="240"/>
+        <Caret Line="84" Column="15" TopLine="71"/>
       </Position15>
       <Position16>
         <Filename Value="uMainForm.pas"/>
-        <Caret Line="303" Column="41" TopLine="261"/>
+        <Caret Line="271" Column="41" TopLine="264"/>
       </Position16>
       <Position17>
         <Filename Value="uMainForm.pas"/>
-        <Caret Line="84" Column="15" TopLine="71"/>
+        <Caret Line="85" Column="15" TopLine="63"/>
       </Position17>
       <Position18>
-        <Filename Value="uMainForm.pas"/>
-        <Caret Line="271" Column="41" TopLine="264"/>
-      </Position18>
-      <Position19>
-        <Filename Value="uMainForm.pas"/>
-        <Caret Line="85" Column="15" TopLine="63"/>
-      </Position19>
-      <Position20>
         <Filename Value="uBrowserFrame.pas"/>
         <Caret Line="113" Column="73" TopLine="90"/>
-      </Position20>
-      <Position21>
+      </Position18>
+      <Position19>
         <Filename Value="uBrowserFrame.pas"/>
         <Caret Line="132" Column="32" TopLine="96"/>
+      </Position19>
+      <Position20>
+        <Filename Value="uMainForm.pas"/>
+        <Caret Line="303" Column="69" TopLine="259"/>
+      </Position20>
+      <Position21>
+        <Filename Value="uMainForm.pas"/>
+        <Caret Line="190" Column="3" TopLine="170"/>
       </Position21>
       <Position22>
         <Filename Value="uMainForm.pas"/>
-        <Caret Line="303" Column="69" TopLine="259"/>
+        <Caret Line="219" TopLine="205"/>
       </Position22>
       <Position23>
         <Filename Value="uMainForm.pas"/>
-        <Caret Line="190" Column="3" TopLine="170"/>
+        <Caret Line="71" TopLine="60"/>
       </Position23>
       <Position24>
-        <Filename Value="uMainForm.pas"/>
-        <Caret Line="219" TopLine="205"/>
+        <Filename Value="uBrowserFrame.pas"/>
+        <Caret Line="78" Column="25" TopLine="62"/>
       </Position24>
       <Position25>
-        <Filename Value="uMainForm.pas"/>
-        <Caret Line="71" TopLine="60"/>
+        <Filename Value="uBrowserFrame.pas"/>
+        <Caret Line="359" Column="49" TopLine="355"/>
       </Position25>
       <Position26>
         <Filename Value="uBrowserFrame.pas"/>
-        <Caret Line="78" Column="25" TopLine="62"/>
+        <Caret Line="77" Column="17" TopLine="56"/>
       </Position26>
       <Position27>
         <Filename Value="uBrowserFrame.pas"/>
-        <Caret Line="359" Column="49" TopLine="355"/>
+        <Caret Line="464" Column="59" TopLine="40"/>
       </Position27>
       <Position28>
         <Filename Value="uBrowserFrame.pas"/>
-        <Caret Line="77" Column="17" TopLine="56"/>
+        <Caret Line="73" Column="41" TopLine="63"/>
       </Position28>
       <Position29>
         <Filename Value="uBrowserFrame.pas"/>
-        <Caret Line="464" Column="59" TopLine="40"/>
+        <Caret Line="326" Column="43" TopLine="305"/>
       </Position29>
+      <Position30>
+        <Filename Value="uBrowserFrame.pas"/>
+        <Caret Line="79" Column="17" TopLine="50"/>
+      </Position30>
     </JumpHistory>
     <RunParams>
       <FormatVersion Value="2"/>

demos/Lazarus_Linux/TabbedBrowser2/uBrowserFrame.lfm

@@ -198,6 +198,7 @@ object BrowserFrame: TBrowserFrame
     Top = 28
     Width = 932
     Align = alClient
+    TabStop = True
     TabOrder = 2
     OnEnter = CEFLinkedWindowParent1Enter
     OnExit = CEFLinkedWindowParent1Exit

demos/Lazarus_Linux/TabbedBrowser2/uBrowserFrame.pas

@@ -309,18 +309,29 @@ begin
   SendCompMessage(CEF_AFTERCREATED);
 end;
 
+// This is a workaround for the CEF issue #2026
+// https://bitbucket.org/chromiumembedded/cef/issues/2026/multiple-major-keyboard-focus-issues-on
+// We use CEFLinkedWindowParent1.OnEnter, CEFLinkedWindowParent1.OnExit and
+// TChromium.OnGotFocus to avoid most of the focus issues.
+// CEFLinkedWindowParent1.TabStop must be TRUE.
+procedure TBrowserFrame.CEFLinkedWindowParent1Exit(Sender: TObject);
+begin
+  if not(csDesigning in ComponentState) then
+    Chromium1.SendCaptureLostEvent;
+end;    
+
 procedure TBrowserFrame.CEFLinkedWindowParent1Enter(Sender: TObject);
 begin
   if not(csDesigning in ComponentState) and
      Chromium1.Initialized and
      not(Chromium1.FrameIsFocused) then
     Chromium1.SendFocusEvent(True);
-end;
+end;   
 
-procedure TBrowserFrame.CEFLinkedWindowParent1Exit(Sender: TObject);
+procedure TBrowserFrame.Chromium1GotFocus(Sender: TObject;
+  const browser: ICefBrowser);
 begin
-  if not(csDesigning in ComponentState) then
-    Chromium1.SendCaptureLostEvent;
+  CEFLinkedWindowParent1.SetFocus;
 end;
 
 procedure TBrowserFrame.BackBtnClick(Sender: TObject);
@@ -360,12 +371,6 @@ begin
   aAction := cbaClose;
 end;
 
-procedure TBrowserFrame.Chromium1GotFocus(Sender: TObject;
-  const browser: ICefBrowser);
-begin
-  CEFLinkedWindowParent1.SetFocus;
-end;
-
 procedure TBrowserFrame.Chromium1LoadError(Sender: TObject;
   const browser: ICefBrowser; const frame: ICefFrame; errorCode: Integer;
   const errorText, failedUrl: ustring);
@@ -431,7 +436,8 @@ var
 begin
   TempURL := BrowserAddress;
 
-  if (URLCbx.Items.IndexOf(TempURL) < 0) then URLCbx.Items.Add(TempURL);
+  if (URLCbx.Items.IndexOf(TempURL) < 0) then
+     URLCbx.Items.Add(TempURL);
 
   URLCbx.Text := TempURL;
 end;