Remove fomantic loader module (#26670)

Replace Fomantic `loader` CSS module with our existing `is-loading`
spinner. Only three places in the UI used this module, which are
pictured here:

imagediff:
<img width="1237" alt="Screenshot 2023-08-22 at 22 18 01"
src="https://github.com/go-gitea/gitea/assets/115237/b0d82531-f05e-43c6-9e5b-1bfc268c056d">

webauthn:
<img width="894" alt="Screenshot 2023-08-22 at 22 05 05"
src="https://github.com/go-gitea/gitea/assets/115237/7b583425-d944-474a-a57a-22a65bbd8b29">

heatmap (I removed the previous loading text, it was unreadable because
it was tiny and on fast machines only visible for a fraction of a
second):
<img width="764" alt="Screenshot 2023-08-22 at 22 18 44"
src="https://github.com/go-gitea/gitea/assets/115237/1c7472d6-3e17-4224-a992-d8c0b380cc73">

Also, heatmap container does not resize any more after loading now and
previous duplicate id `user-heatmap` is gone.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

1 files changed, 9 insertions, 23 deletions

diff --git a/web_src/css/features/heatmap.css b/web_src/css/features/heatmap.css
index d0cd2b5734..364754751a 100644
--- a/web_src/css/features/heatmap.css
+++ b/web_src/css/features/heatmap.css
@@ -2,7 +2,15 @@
   width: 100%;
   font-size: 9px;
   position: relative;
-  min-height: 125px;
+}
+
+/* before the Vue component is mounted, show a loading indicator with dummy size */
+/* the ratio is guesswork, see https://github.com/razorness/vue3-calendar-heatmap/issues/26 */
+#user-heatmap.is-loading {
+  aspect-ratio: 5.415; /* the size is about 790 x 145 */
+}
+.user.profile #user-heatmap.is-loading {
+  aspect-ratio: 5.645; /* the size is about 953 x 169 */
 }
 
 #user-heatmap text {
@@ -32,37 +40,15 @@
 }
 
 @media (max-width: 1200px) {
-  #user-heatmap {
-    min-height: 105px;
-  }
   #user-heatmap .total-contributions {
     left: 21px;
   }
 }
 
 @media (max-width: 1000px) {
-  #user-heatmap {
-    min-height: 80px;
-  }
   #user-heatmap .total-contributions {
     font-size: 10px;
     left: 17px;
     bottom: -4px;
   }
 }
-
-.user.profile #user-heatmap {
-  min-height: 135px;
-}
-
-@media (max-width: 1200px) {
-  .user.profile #user-heatmap {
-    min-height: 115px;
-  }
-}
-
-@media (max-width: 1000px) {
-  .user.profile #user-heatmap {
-    min-height: 90px;
-  }
-}