[BUG] Remove case-insensitive duplicate files within a directory.

.github/workflows/arduino_library_manager_linter.yml

@@ -20,3 +20,15 @@ jobs:
         with:
           library-manager: update
           compliance: strict
+  detect-duplicate-files:
+  # Detect case-insensitive file duplication in the same directory.
+  # This can cause a problem for the Arduino IDE on Windows & Macs.
+  # See:
+  # - https://github.com/arduino/Arduino/issues/11441
+  # - https://github.com/crankyoldgit/IRremoteESP8266/issues/1451
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Look for case-insensitive filename collisions.
+      run: DUPS=$(find . -path '*/.pio' -prune -o -print | sort | uniq -D -i); if [[ -n "${DUPS}" ]]; then echo -e "Duplicates found:\n${DUPS}"; false; fi

docs/doxygen/html/IRremoteESP8266_8h_source.html

@@ -123,7 +123,7 @@
 <div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="preprocessor">#endif  // UNIT_TEST</span></div>
 <div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160; </div>
 <div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment">// Library Version</span></div>
-<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="preprocessor">#define _IRREMOTEESP8266_VERSION_ &quot;2.7.16&quot;</span></div>
+<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="preprocessor">#define _IRREMOTEESP8266_VERSION_ &quot;2.7.17&quot;</span></div>
 <div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160; </div>
 <div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="comment">// Set the language &amp; locale for the library. See the `locale` dir for options.</span></div>
 <div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="preprocessor">#ifndef _IR_LOCALE_</span></div>