Fix issues.

Runtime/service/text_input.cs

             this.text = text;
             this.composing = composing ?? TextRange.empty;
 
-            if (selection != null) {
+            if (selection != null && selection.start >= 0 && selection.end >= 0) {
                 // handle emoji, which takes 2 bytes
                 // if selection cuts in the middle of the emoji, move it to the end
                 int start = selection.start, end = selection.end;

Tests/Resources/india_chettinad_silk_maker.png.meta

 fileFormatVersion: 2
 guid: 759295bbc368246a0877963ba053ed5d
 TextureImporter:
-  fileIDToRecycleName: {}
+  internalIDToNameTable: []
-  serializedVersion: 9
+  serializedVersion: 10
   mipmaps:
     mipMapMode: 0
     enableMipMap: 1
     wrapU: -1
     wrapV: -1
     wrapW: -1
-  nPOTScale: 1
+  nPOTScale: 0
   lightmap: 0
   compressionQuality: 50
   spriteMode: 0
     allowsAlphaSplitting: 0
     overridden: 0
     androidETC2FallbackOverride: 0
+  - serializedVersion: 2
+    buildTarget: Standalone
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+    androidETC2FallbackOverride: 0
+  - serializedVersion: 2
+    buildTarget: iPhone
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+    androidETC2FallbackOverride: 0
+  - serializedVersion: 2
+    buildTarget: Android
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+    androidETC2FallbackOverride: 0
+  - serializedVersion: 2
+    buildTarget: WebGL
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+    androidETC2FallbackOverride: 0
   spriteSheet:
     serializedVersion: 2
     sprites: []
     spriteID: 
+    internalID: 0
+    secondaryTextures: []
   spritePackingTag: 
   pSDRemoveMatte: 0
   pSDShowRemoveMatteOption: 0

Tests/Resources/india_thanjavur_market.png.meta

 fileFormatVersion: 2
 guid: 69711c649948f4cb1ad20b82f1926a29
 TextureImporter:
-  fileIDToRecycleName: {}
+  internalIDToNameTable: []
-  serializedVersion: 9
+  serializedVersion: 10
   mipmaps:
     mipMapMode: 0
     enableMipMap: 1
     wrapU: -1
     wrapV: -1
     wrapW: -1
-  nPOTScale: 1
+  nPOTScale: 0
   lightmap: 0
   compressionQuality: 50
   spriteMode: 0
     allowsAlphaSplitting: 0
     overridden: 0
     androidETC2FallbackOverride: 0
+  - serializedVersion: 2
+    buildTarget: Standalone
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+    androidETC2FallbackOverride: 0
+  - serializedVersion: 2
+    buildTarget: iPhone
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+    androidETC2FallbackOverride: 0
+  - serializedVersion: 2
+    buildTarget: Android
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+    androidETC2FallbackOverride: 0
+  - serializedVersion: 2
+    buildTarget: WebGL
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+    androidETC2FallbackOverride: 0
   spriteSheet:
     serializedVersion: 2
     sprites: []
     spriteID: 
+    internalID: 0
+    secondaryTextures: []
   spritePackingTag: 
   pSDRemoveMatte: 0
   pSDShowRemoveMatteOption: 0