Give the video effects more room in the Add effect menu

With eight video effects their list filled its 110-pixel cap, and the menu's
headings take more than the 120 pixels the height test allowed for them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -59,6 +59,8 @@ commit that made it. The interface shows this file under Changelog in its menu.
 - Save opens in the project's folder, and after the first save it offers the
   last saved file's name with a number counted on (`city.png`, then
   `city-1.png`, `city-2.png`), skipping names already taken.
+- The Add effect menu gives the video effects more room before their list
+  scrolls, now that there are more of them.
 
 ## [0.7.0] - 2026-09-26
 

src/gui/window.cpp

@@ -1779,8 +1779,8 @@ Gtk::Widget& EffectorWindow::buildChainSection() {
 // The tallest each part of the menu of effects grows before it scrolls, in
 // pixels: together, with their headings, short enough to open below a button
 // near the top of a small screen.
-constexpr int addMenuImageHeight = 330;
+constexpr int addMenuImageHeight = 300;
-constexpr int addMenuVideoHeight = 110;
+constexpr int addMenuVideoHeight = 150;
 
 // One entry per registered effect, so a new effect shows up here without this
 // file knowing anything about it. The image effects and the video effects

tests/gui_tests.cpp

@@ -242,7 +242,9 @@ void runTests(Gtk::Window& window) {
     }
     check(scrolled, "the image and the video entries scroll, each on their own");
     check(cap > 0 && cap <= 480, "past a height that fits a small screen");
-    check(menu->get_height() > 0 && menu->get_height() <= cap + 120,
+    // The rest is the two headings, the separator and, in a still, the hint
+    // under the video heading.
+    check(menu->get_height() > 0 && menu->get_height() <= cap + 170,
           "and the menu stays within it however many effects there are");
     add->popdown();
     pump();