Fix truncating branches to the right edge of the view when scrolled to the left

When scrolling the view to the left, the available width becomes the width of
the view plus the scroll position.

Author: stefanhaller

Diff for: pkg/gui/context/branches_context.go

@@ -30,7 +30,7 @@ func NewBranchesContext(c *ContextCommon) *BranchesContext {
 			c.State().GetItemOperation,
 			c.State().GetRepoState().GetScreenMode() != types.SCREEN_NORMAL,
 			c.Modes().Diffing.Ref,
-			c.Views().Branches.InnerWidth(),
+			c.Views().Branches.InnerWidth()+c.Views().Branches.OriginX(),
 			c.Tr,
 			c.UserConfig(),
 			c.Model().Worktrees,