[SES-2574] Fix crash on gallery screen (#1632)

app/src/main/java/org/thoughtcrime/securesms/media/MediaPage.kt

@@ -152,12 +152,30 @@ private fun ThumbnailRow(
                         ) {
                             it.diskCacheStrategy(DiskCacheStrategy.NONE)
                         }
-                    } else if (item.hasPlaceholder) {
+                    } else {
+                        // The resource given by the placeholder needs tinting according to our theme.
+                        // But the missing thumbnail picture does not.
+                        var (placeholder, shouldTint) = if (item.hasPlaceholder) {
+                            item.placeholder(LocalContext.current) to true
+                        } else {
+                            R.drawable.ic_missing_thumbnail_picture to false
+                        }
+
+                        if (placeholder == 0) {
+                            placeholder = R.drawable.ic_missing_thumbnail_picture
+                            shouldTint = false
+                        }
+
                         Image(
-                            painter = painterResource(item.placeholder(LocalContext.current)),
+                            painter = painterResource(placeholder),
                             contentDescription = null,
                             modifier = Modifier.fillMaxSize(),
-                            contentScale = ContentScale.Inside
+                            contentScale = ContentScale.Inside,
+                            colorFilter = if (shouldTint) {
+                                ColorFilter.tint(LocalColors.current.textSecondary)
+                            } else {
+                                null
+                            }
                         )
                     }
 

app/src/main/res/values/themes.xml

@@ -58,7 +58,10 @@
        <item name="attachment_document_icon_small">@drawable/ic_document_small_dark</item>
        <item name="attachment_document_icon_large">@drawable/ic_document_large_dark</item>
        <item name="colorError">?danger</item>
-    </style>
+
+       <item name="conversation_icon_attach_audio">@drawable/ic_audio_dark</item>
+       <item name="conversation_icon_attach_video">@drawable/ic_video_dark</item>
+   </style>
 
     <!-- This should be the default theme for the application. -->
     <style name="Theme.Session.DayNight" parent="Base.Theme.Session">
@@ -206,9 +209,6 @@
         <item name="linkpreview_secondary_text_color">?android:textColorPrimary</item>
         <item name="linkpreview_divider_color">@color/transparent</item>
 
-        <item name="conversation_icon_attach_audio">@drawable/ic_audio_dark</item>
-        <item name="conversation_icon_attach_video">@drawable/ic_video_dark</item>
-
         <item name="sticker_management_icon">@drawable/sticker_button_dark</item>
         <item name="sticker_management_divider_color">@color/core_grey_75</item>
         <item name="sticker_management_empty_background_color">@color/core_grey_85</item>