Bump gocui and adapt lazygit code

Original commit message of the gocui change:

This fixes View.Size, Width and Height to be the correct (outer) size of a view
including its frame, and InnerSize/InnerWidth/InnerHeight to be the usable
client area exluding the frame. Previously, Size was actually the InnerSize (and
a lot of client code used it as such, so these need to be changed to InnerSize).
InnerSize, on the other hand, was *one* less than Size (not two, as you would
have expected), and in many cases this was made up for at call sites by adding 1
(e.g. in calcRealScrollbarStartEnd, parseInput, and many other places in the
lazygit code).

There are still some weird things left that I didn't address here:
- a view's lower-right coordinates (x1/y1) are one less than you would expect.
  For example, a view with a 2x2 client area like this:
    ╭──╮
    │ab│
    │cd│
    ╰──╯
  in the top-left corner of the screen (x0 and y0 both zero) has x1/xy at 3, not
  4 as would be more natural.
- a view without a frame has its coordinates extended by 1 on all sides; to
  illustrate, the same 2x2 view as before but without a frame, sitting in the
  top-left corder of the screen, has coordinates x0=-1, y0=-1, x1=2, y1=2. This
  is highly confusing and unexpected.

I left these as they are because they would be even more of a breaking change,
and also because they don't have quite as much of an impact on general app code.

pkg/gui/patch_exploring/focus.go

@@ -11,8 +11,8 @@ func calculateOrigin(currentOrigin int, bufferHeight int, numLines int, firstLin
 // is as close to being in view as possible.
 func calculateNewOriginWithNeededAndWantedIdx(currentOrigin int, bufferHeight int, numLines int, needToSeeIdx int, wantToSeeIdx int) int {
 	origin := currentOrigin
-	if needToSeeIdx < currentOrigin || needToSeeIdx > currentOrigin+bufferHeight {
-		origin = max(min(needToSeeIdx-bufferHeight/2, numLines-bufferHeight-1), 0)
+	if needToSeeIdx < currentOrigin || needToSeeIdx >= currentOrigin+bufferHeight {
+		origin = max(min(needToSeeIdx-bufferHeight/2, numLines-bufferHeight), 0)
 	}
 
 	bottom := origin + bufferHeight
@@ -21,7 +21,7 @@ func calculateNewOriginWithNeededAndWantedIdx(currentOrigin int, bufferHeight in
 		requiredChange := origin - wantToSeeIdx
 		allowedChange := bottom - needToSeeIdx
 		return origin - min(requiredChange, allowedChange)
-	} else if wantToSeeIdx > origin+bufferHeight {
+	} else if wantToSeeIdx >= bottom {
 		requiredChange := wantToSeeIdx - bottom
 		allowedChange := needToSeeIdx - origin
 		return origin + min(requiredChange, allowedChange)

pkg/gui/patch_exploring/focus_test.go

@@ -62,7 +62,7 @@ func TestNewOrigin(t *testing.T) {
 			lastLineIdx:     199,
 			selectedLineIdx: 199,
 			selectMode:      LINE,
-			expected:        99,
+			expected:        100,
 		},
 		{
 			name:            "selection within scroll window",