Show specific frame when updating screen (#4264)

* Updated setFrames in Screen.cpp

Added code to attempt to revert back to the same frame that user was on prior to setFrame reload.

* Space added Screen.cpp

* Update Screen.cpp

Make screen to revert to Frame 0 if the originally displayed frame is no longer there.

* Update Screen.cpp

Inserted boolean holdPosition into setFrames to indicate the requirement to stay on the same frame ( if =true) or else it will switch to new frame .
Only Screen::handleStatusUpdate calls with setFrame(true). ( For Node Updates)
All other types of updates call as before setFrame(), so it will change focus as needed.

* Hold position, even if number of frames increases

* Hold position, if handling an outgoing text message

* Update Screen.cpp

* Reverted chnages related to devicestate.has_rx_text_message

* Reset to master

* CannedMessages only handles routing packets when waiting for ACK
Previously, this was calling Screen::setFrames at unexpected times

* Gather position info about screen frames while regenerating

* Make admin module observable
Notify only when relevant. Currently: only to handle remove_nodenum.

* Optionally specify which frame to focus when setFrames runs

* UIFrameEvent uses enum instead of multiple booleans

* Allow modules to request their own frame to be focussed
This is done internally by calling MeshModule::requestFocus()
Easier this way, insteady of passing the info in the UIFrameEvent:
* Modules don't always know whether they should be focussed until after the UIFrameEvent has been raised, in dramFrame
* Don't have to pass reference to module instance as parameter though several methods

* E-Ink screensaver uses FOCUS_PRESERVE
Previously, it had its own basic implementation of this.

* Spelling: regional variant

* trunk

* Fix HAS_SCREEN guarding

* More HAS_SCREEN guarding

---------

Co-authored-by: BIST <77391720+slash-bit@users.noreply.github.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: slash-bit <v-b2@live.com>

src/mesh/MeshModule.cpp

@@ -284,4 +284,17 @@ AdminMessageHandleResult MeshModule::handleAdminMessageForAllModules(const mesht
         }
     }
     return handled;
-}
+}
+
+#if HAS_SCREEN
+// Would our module like its frame to be focused after Screen::setFrames has regenerated the list of frames?
+// Only considered if setFrames is triggered by a UIFrameEvent
+bool MeshModule::isRequestingFocus()
+{
+    if (_requestingFocus) {
+        _requestingFocus = false; // Consume the request
+        return true;
+    } else
+        return false;
+}
+#endif