Ignore backspace when appending to the filter string in SampleApp. Fixes a bug on Windows where the initial Backspace gets appended, causing no slides to match.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1767683002

Review URL: https://codereview.chromium.org/1767683002

1 files changed, 3 insertions, 1 deletions

diff --git a/samplecode/OverView.cpp b/samplecode/OverView.cpp
index d7633452bc..8520f57000 100644
--- a/samplecode/OverView.cpp
+++ b/samplecode/OverView.cpp
@@ -59,7 +59,9 @@ protected:
         }
         SkUnichar uni;
         if (SampleCode::CharQ(*evt, &uni)) {
-            fMatchStr.appendUnichar(uni);
+            if (uni >= ' ') {
+                fMatchStr.appendUnichar(uni);
+            }
             this->inval(nullptr);
             return true;
         }