Implement iOSPatch flag

Author: JayPanoz

css/ReadiumCSS-config.css

@@ -50,5 +50,6 @@
 @custom-selector :--ltr [dir="ltr"];
 @custom-selector :--rtl [dir="rtl"];
 
-/* Patch for iPadOS */
+/* Patch for iOS and iPadOS */
+@custom-selector :--iOS-patch [style*="readium-iOSPatch-on"];
 @custom-selector :--ipadOS-patch [style*="readium-iPadOSPatch-on"];

css/dist/ReadiumCSS-after.css

@@ -421,10 +421,14 @@ body{
   vertical-align:baseline !important;
 }
 
-:root:not([style*="readium-deprecatedFontSize-on"])[style*="--USER__fontSize"] body{
+:root:not([style*="readium-deprecatedFontSize-on"]):not([style*="readium-iOSPatch-on"])[style*="--USER__fontSize"] body{
   zoom:var(--USER__fontSize) !important;
 }
 
+:root[style*="readium-iOSPatch-on"][style*="--USER__fontSize"] body{
+  -webkit-text-size-adjust:var(--USER__fontSize) !important;
+}
+
 @supports not (zoom: 1){
 
   :root[style*="--USER__fontSize"]{

css/dist/cjk-horizontal/ReadiumCSS-after.css

@@ -349,10 +349,14 @@ body{
   font-family:revert !important;
 }
 
-:root:not([style*="readium-deprecatedFontSize-on"])[style*="--USER__fontSize"] body{
+:root:not([style*="readium-deprecatedFontSize-on"]):not([style*="readium-iOSPatch-on"])[style*="--USER__fontSize"] body{
   zoom:var(--USER__fontSize) !important;
 }
 
+:root[style*="readium-iOSPatch-on"][style*="--USER__fontSize"] body{
+  -webkit-text-size-adjust:var(--USER__fontSize) !important;
+}
+
 @supports not (zoom: 1){
 
   :root[style*="--USER__fontSize"]{

css/dist/cjk-vertical/ReadiumCSS-after.css

@@ -334,10 +334,14 @@ body{
   font-family:revert !important;
 }
 
-:root:not([style*="readium-deprecatedFontSize-on"])[style*="--USER__fontSize"] body{
+:root:not([style*="readium-deprecatedFontSize-on"]):not([style*="readium-iOSPatch-on"])[style*="--USER__fontSize"] body{
   zoom:var(--USER__fontSize) !important;
 }
 
+:root[style*="readium-iOSPatch-on"][style*="--USER__fontSize"] body{
+  -webkit-text-size-adjust:var(--USER__fontSize) !important;
+}
+
 @supports not (zoom: 1){
 
   :root[style*="--USER__fontSize"]{

css/dist/rtl/ReadiumCSS-after.css

@@ -363,10 +363,14 @@ body{
   font-family:revert !important;
 }
 
-:root:not([style*="readium-deprecatedFontSize-on"])[style*="--USER__fontSize"] body{
+:root:not([style*="readium-deprecatedFontSize-on"]):not([style*="readium-iOSPatch-on"])[style*="--USER__fontSize"] body{
   zoom:var(--USER__fontSize) !important;
 }
 
+:root[style*="readium-iOSPatch-on"][style*="--USER__fontSize"] body{
+  -webkit-text-size-adjust:var(--USER__fontSize) !important;
+}
+
 @supports not (zoom: 1){
 
   :root[style*="--USER__fontSize"]{

css/src/modules/user-settings-submodules/ReadiumCSS-fontSize_pref.css

@@ -6,10 +6,14 @@
 
    Repo: https://github.com/readium/css */
 
-:root:not(:--deprecated-font-size)[style*="--USER__fontSize"] body {
+:root:not(:--deprecated-font-size):not(:--iOS-patch)[style*="--USER__fontSize"] body {
   zoom: var(--USER__fontSize) !important;
 }
 
+:root:--iOS-patch[style*="--USER__fontSize"] body {
+  -webkit-text-size-adjust: var(--USER__fontSize) !important;
+}
+
 /* Older deprecated implementation for when zoom is not supported
    or it is explicitly enabled because you don’t want the new one */