Improve CannedMessageModule usability

- Don't let Screen timer jump away from CannedMessageModule frame
- Correctly timeout CannedMessageModule with INACTIVATE_AFTER_MS
- Don't reset half-typed messages on timeout

src/graphics/Screen.cpp

@@ -45,6 +45,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "mesh/generated/meshtastic/deviceonly.pb.h"
 #include "meshUtils.h"
 #include "modules/AdminModule.h"
+#include "modules/CannedMessageModule.h"
 #include "modules/ExternalNotificationModule.h"
 #include "modules/TextMessageModule.h"
 #include "sleep.h"
@@ -2317,6 +2318,12 @@ void Screen::handleOnPress()
     if (scanAndSelectInput != nullptr && scanAndSelectInput->dismissCannedMessageFrame())
         return;
 
+    // Don't transition away from canned messages if it is active
+    if (cannedMessageModule->shouldDraw()) {
+        lastScreenTransition = millis();
+        return;
+    }
+
     // If screen was off, just wake it, otherwise advance to next frame
     // If we are in a transition, the press must have bounced, drop it.
     if (ui->getUiState()->frameState == FIXED) {

src/modules/CannedMessageModule.cpp

@@ -360,12 +360,9 @@ int CannedMessageModule::handleInputEvent(const InputEvent *event)
     if (validEvent) {
         requestFocus(); // Tell Screen::setFrames to move to our module's frame, next time it runs
 
-        // Let runOnce to be called immediately.
-        if (this->runState == CANNED_MESSAGE_RUN_STATE_ACTION_SELECT) {
-            setIntervalFromNow(0); // on fast keypresses, this isn't fast enough.
-        } else {
-            runOnce();
-        }
+        // Run CannedMessageModule thread now from callee thread context,
+        // and also schedule it to run later in its own context with the requested delay.
+        setIntervalFromNow(runOnce());
     }
 
     return 0;
@@ -423,11 +420,8 @@ int32_t CannedMessageModule::runOnce()
         this->notifyObservers(&e);
     } else if (((this->runState == CANNED_MESSAGE_RUN_STATE_ACTIVE) || (this->runState == CANNED_MESSAGE_RUN_STATE_FREETEXT)) &&
                ((millis() - this->lastTouchMillis) > INACTIVATE_AFTER_MS)) {
-        // Reset module
+        // Don't reset module, just hide the frame
         e.action = UIFrameEvent::Action::REGENERATE_FRAMESET; // We want to change the list of frames shown on-screen
-        this->currentMessageIndex = -1;
-        this->freetext = ""; // clear freetext
-        this->cursor = 0;
 
 #if !defined(T_WATCH_S3) && !defined(RAK14014)
         this->destSelect = CANNED_MESSAGE_DESTINATION_TYPE_NONE;