Support frame resize on firefox (#1088)

* Add popup functions for getting/setting the frame size

* Add frontend functions for getting/setting popup frame size

* Expose display mode attribute on display HTML

* Disable resizer on iframe

* Add custom frame resizer handle

* Add support for custom frame resizer

2 files changed, 51 insertions, 2 deletions

diff --git a/ext/mixed/css/display.css b/ext/mixed/css/display.css
index 605c0148..0a676a8f 100644
--- a/ext/mixed/css/display.css
+++ b/ext/mixed/css/display.css
@@ -1119,6 +1119,52 @@ button.action-button {
 }
 
 
+/* Frame resizer */
+.frame-resizer-container {
+    position: fixed;
+    bottom: 0;
+    right: 0;
+    z-index: 100;
+    background: transparent;
+    pointer-events: none;
+    user-select: none;
+}
+.frame-resizer-sizer1 {
+    padding-top: 100%;
+    line-height: 0;
+}
+.frame-resizer-sizer2 {
+    display: inline-block;
+    overflow-x: hidden;
+    overflow-y: scroll;
+    vertical-align: bottom;
+}
+.frame-resizer-sizer2.frame-resizer-sizer2-with-min-size {
+    min-width: 1em;
+}
+.frame-resizer-svg {
+    display: block;
+    position: absolute;
+    bottom: 0;
+    right: 0;
+    width: 75%;
+    height: 75%;
+}
+.frame-resizer-handle {
+    fill: var(--default-text-color);
+    opacity: 0.125;
+    cursor: se-resize;
+    pointer-events: auto;
+    transition:
+        fill var(--animation-duration) linear,
+        opacity var(--animation-duration) linear;
+}
+.frame-resizer-handle:hover {
+    fill: var(--accent-color);
+    opacity: 1;
+}
+
+
 /* Conditional styles */
 :root:not([data-enable-search-tags=true]) .tag[data-category=search] {
     display: none;
@@ -1221,3 +1267,7 @@ button.action-button {
 :root:not([data-glossary-layout-mode=compact]) .term-glossary-image-description {
     display: block;
 }
+
+:root[data-popup-display-mode=full-width] .frame-resizer-container {
+    display: none;
+}
diff --git a/ext/mixed/css/popup-outer.css b/ext/mixed/css/popup-outer.css
index 74307d9f..0ee8df9e 100644
--- a/ext/mixed/css/popup-outer.css
+++ b/ext/mixed/css/popup-outer.css
@@ -22,7 +22,7 @@ iframe.yomichan-popup {
     border: 1em solid #999999;
     box-shadow: 0 0 10em rgba(0, 0, 0, 0.5);
     position: fixed;
-    resize: both;
+    resize: none;
     visibility: hidden;
     z-index: 2147483647;
     box-sizing: border-box;
@@ -38,7 +38,6 @@ iframe.yomichan-popup[data-outer-theme=auto][data-site-color=dark] {
 iframe.yomichan-popup[data-popup-display-mode=full-width] {
     border-left: none;
     border-right: none;
-    resize: none;
 }
 iframe.yomichan-popup[data-popup-display-mode=full-width][data-below=true] {
     border-bottom: none;