fix race condition when scrolling to merge conflict

pkg/gui/files_panel.go

@@ -398,25 +398,6 @@ func (gui *Gui) refreshStateFiles() error {
 	return nil
 }
 
-func (gui *Gui) catSelectedFile(g *gocui.Gui) (string, error) {
-	item, err := gui.getSelectedFile()
-	if err != nil {
-		if err != gui.Errors.ErrNoFiles {
-			return "", err
-		}
-		return "", gui.newStringTask("main", gui.Tr.SLocalize("NoFilesDisplay"))
-	}
-	if item.Type != "file" {
-		return "", gui.newStringTask("main", gui.Tr.SLocalize("NotAFile"))
-	}
-	cat, err := gui.GitCommand.CatFile(item.Name)
-	if err != nil {
-		gui.Log.Error(err)
-		return "", gui.newStringTask("main", err.Error())
-	}
-	return cat, nil
-}
-
 func (gui *Gui) handlePullFiles(g *gocui.Gui, v *gocui.View) error {
 	// if we have no upstream branch we need to set that first
 	currentBranch := gui.currentBranch()

pkg/gui/layout.go

@@ -398,7 +398,7 @@ func (gui *Gui) layout(g *gocui.Gui) error {
 		searchPrefixView.BgColor = gocui.ColorDefault
 		searchPrefixView.FgColor = gocui.ColorGreen
 		searchPrefixView.Frame = false
-		gui.setViewContent(gui.g, searchPrefixView, searchPrefix)
+		gui.setViewContent(searchPrefixView, searchPrefix)
 	}
 
 	if searchView, err := g.SetView("search", appStatusOptionsBoundary-1+searchViewOffset+len(searchPrefix), height-2+searchViewOffset, optionsVersionBoundary+searchViewOffset, height+searchViewOffset, 0); err != nil {
@@ -440,7 +440,7 @@ func (gui *Gui) layout(g *gocui.Gui) error {
 		}
 	}
 	if gui.State.OldInformation != information {
-		gui.setViewContent(g, informationView, information)
+		gui.setViewContent(informationView, information)
 		gui.State.OldInformation = information
 	}
 

pkg/gui/line_by_line_panel.go

@@ -88,7 +88,7 @@ func (gui *Gui) refreshLineByLinePanel(diff string, secondaryDiff string, second
 	}
 
 	gui.g.Update(func(*gocui.Gui) error {
-		gui.setViewContent(gui.g, gui.getSecondaryView(), secondaryPatchParser.Render(-1, -1, nil))
+		gui.setViewContent(gui.getSecondaryView(), secondaryPatchParser.Render(-1, -1, nil))
 		return nil
 	})
 
@@ -242,7 +242,7 @@ func (gui *Gui) refreshMainView() error {
 	mainView.Wrap = false
 
 	gui.g.Update(func(*gocui.Gui) error {
-		gui.setViewContent(gui.g, gui.getMainView(), colorDiff)
+		gui.setViewContent(gui.getMainView(), colorDiff)
 		return nil
 	})
 

pkg/gui/merge_panel.go

@@ -222,19 +222,39 @@ func (gui *Gui) refreshMergePanel() error {
 		return err
 	}
 
-	mainView := gui.getMainView()
-	mainView.Wrap = false
-	if err := gui.newStringTask("main", content); err != nil {
-		return err
-	}
-
 	if err := gui.scrollToConflict(gui.g); err != nil {
 		return err
 	}
 
+	mainView := gui.getMainView()
+	mainView.Wrap = false
+
+	if err := gui.newStringTaskWithoutScroll("main", content); err != nil {
+		return err
+	}
+
 	return nil
 }
 
+func (gui *Gui) catSelectedFile(g *gocui.Gui) (string, error) {
+	item, err := gui.getSelectedFile()
+	if err != nil {
+		if err != gui.Errors.ErrNoFiles {
+			return "", err
+		}
+		return "", gui.newStringTask("main", gui.Tr.SLocalize("NoFilesDisplay"))
+	}
+	if item.Type != "file" {
+		return "", gui.newStringTask("main", gui.Tr.SLocalize("NotAFile"))
+	}
+	cat, err := gui.GitCommand.CatFile(item.Name)
+	if err != nil {
+		gui.Log.Error(err)
+		return "", gui.newStringTask("main", err.Error())
+	}
+	return cat, nil
+}
+
 func (gui *Gui) scrollToConflict(g *gocui.Gui) error {
 	panelState := gui.State.Panels.Merging
 	if len(panelState.Conflicts) == 0 {

pkg/gui/patch_building_panel.go

@@ -94,7 +94,7 @@ func (gui *Gui) refreshSecondaryPatchPanel() error {
 		secondaryView.Wrap = false
 
 		gui.g.Update(func(*gocui.Gui) error {
-			gui.setViewContent(gui.g, gui.getSecondaryView(), gui.GitCommand.PatchManager.RenderAggregatedPatchColored(false))
+			gui.setViewContent(gui.getSecondaryView(), gui.GitCommand.PatchManager.RenderAggregatedPatchColored(false))
 			return nil
 		})
 	} else {

pkg/gui/status_panel.go

@@ -42,7 +42,7 @@ func (gui *Gui) refreshStatus() {
 	status += fmt.Sprintf("%s → %s ", repoName, name)
 
 	gui.g.Update(func(*gocui.Gui) error {
-		gui.setViewContent(gui.g, gui.getStatusView(), status)
+		gui.setViewContent(gui.getStatusView(), status)
 		return nil
 	})
 }

pkg/gui/tasks_adapter.go

@@ -70,6 +70,26 @@ func (gui *Gui) newStringTask(viewName string, str string) error {
 	return nil
 }
 
+func (gui *Gui) newStringTaskWithoutScroll(viewName string, str string) error {
+	view, err := gui.g.View(viewName)
+	if err != nil {
+		return nil // swallowing for now
+	}
+
+	manager := gui.getManager(view)
+
+	f := func(stop chan struct{}) error {
+		gui.setViewContent(view, str)
+		return nil
+	}
+
+	if err := manager.NewTask(f); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func (gui *Gui) getManager(view *gocui.View) *tasks.ViewBufferManager {
 	manager, ok := gui.viewBufferManagerMap[view.Name()]
 	if !ok {

pkg/gui/view_helpers.go

@@ -340,7 +340,7 @@ func (gui *Gui) cleanString(s string) string {
 	return utils.NormalizeLinefeeds(output)
 }
 
-func (gui *Gui) setViewContent(g *gocui.Gui, v *gocui.View, s string) {
+func (gui *Gui) setViewContent(v *gocui.View, s string) {
 	v.Clear()
 	fmt.Fprint(v, gui.cleanString(s))
 }
@@ -358,7 +358,7 @@ func (gui *Gui) renderString(g *gocui.Gui, viewName, s string) {
 		if err := v.SetCursor(0, 0); err != nil {
 			return err
 		}
-		gui.setViewContent(gui.g, v, s)
+		gui.setViewContent(v, s)
 		return nil
 	})
 }