Don't draw out of bounds line numbers

src/basic/math.cpp

@@ -125,6 +125,18 @@ Rect2 Shrink(Rect2 result, float v) {
     return result;
 }
 
+Rect2 ShrinkVertical(Rect2 result, float v) {
+    result.min.y += v;
+    result.max.y -= v;
+    return result;
+}
+
+Rect2 ShrinkHorizontal(Rect2 result, float v) {
+    result.min.x += v;
+    result.max.x -= v;
+    return result;
+}
+
 Vec2 GetMid(Rect2 r) {
     Vec2 size = GetSize(r);
     size.x /= 2.f;

src/text_editor/window_draw.cpp

@@ -170,7 +170,7 @@ void DrawWindow(Window *window) {
         SetScissor(window->line_numbers_rect);
 
         Rect2I vlines = GetVisibleCells(window);
-        for (Int line = vlines.min.y; line <= vlines.max.y; line += 1) {
+        for (Int line = vlines.min.y; line <= visible.max.y && line >= 0 && line < buffer->line_starts.len; line += 1) {
             Scratch scratch;
             Vec2I   pos = {0, line * FontLineSpacing};
             pos.y -= view->scroll.y;