Merge pull request #17760 from charlespierce/preserve_layout

#14464 Preserve editor size when switching layout

src/vs/workbench/browser/parts/editor/editorGroupsControl.ts

@@ -758,7 +758,7 @@ export class EditorGroupsControl implements IEditorGroupsControl, IVerticalSashL
 			this.sashTwo.setOrientation(this.layoutVertically ? Orientation.VERTICAL : Orientation.HORIZONTAL);
 
 			// Trigger layout
-			this.arrangeGroups(GroupArrangement.EVEN);
+			this.arrangeGroups();
 		}
 	}
 
@@ -766,7 +766,7 @@ export class EditorGroupsControl implements IEditorGroupsControl, IVerticalSashL
 		return this.layoutVertically ? 'vertical' : 'horizontal';
 	}
 
-	public arrangeGroups(arrangement: GroupArrangement): void {
+	public arrangeGroups(arrangement?: GroupArrangement): void {
 		if (!this.dimension) {
 			return; // too early
 		}
@@ -778,27 +778,49 @@ export class EditorGroupsControl implements IEditorGroupsControl, IVerticalSashL
 			return; // need more editors
 		}
 
-		// Minimize Others
-		if (arrangement === GroupArrangement.MINIMIZE_OTHERS) {
-			POSITIONS.forEach(position => {
-				if (this.visibleEditors[position]) {
-					if (position !== this.lastActivePosition) {
-						this.silosSize[position] = this.minSize;
-						availableSize -= this.minSize;
+		switch (arrangement) {
+			case GroupArrangement.MINIMIZE_OTHERS:
+				// Minimize Others
+				POSITIONS.forEach(position => {
+					if (this.visibleEditors[position]) {
+						if (position !== this.lastActivePosition) {
+							this.silosSize[position] = this.minSize;
+							availableSize -= this.minSize;
+						}
 					}
-				}
-			});
+				});
 
-			this.silosSize[this.lastActivePosition] = availableSize;
-		}
+				this.silosSize[this.lastActivePosition] = availableSize;
+				break;
+			case GroupArrangement.EVEN:
+				// Even Sizes
+				POSITIONS.forEach(position => {
+					if (this.visibleEditors[position]) {
+						this.silosSize[position] = availableSize / visibleEditors;
+					}
+				});
+				break;
+			default:
+				// Minimized editors should remain minimized, others should keep their relative Sizes
+				let oldNonMinimizedTotal = 0;
+				POSITIONS.forEach(position => {
+					if (this.visibleEditors[position]) {
+						if (this.silosMinimized[position]) {
+							this.silosSize[position] = this.minSize;
+							availableSize -= this.minSize;
+						} else {
+							oldNonMinimizedTotal += this.silosSize[position];
+						}
+					}
+				});
 
-		// Even Sizes
-		else if (arrangement === GroupArrangement.EVEN) {
-			POSITIONS.forEach(position => {
-				if (this.visibleEditors[position]) {
-					this.silosSize[position] = availableSize / visibleEditors;
-				}
-			});
+				// Set size for non-minimized editors
+				const scaleFactor = availableSize / oldNonMinimizedTotal;
+				POSITIONS.forEach(position => {
+					if (this.visibleEditors[position] && !this.silosMinimized[position]) {
+						this.silosSize[position] *= scaleFactor;
+					}
+				});
 		}
 
 		// Since we triggered a change in minimized/maximized editors, we need