Add license of zsh-users/zaw (GitHub) and point code that comes from Zaw

LICENSE_zaw

@@ -0,0 +1,26 @@
+Copyright (c) 2011, NAKAMURA Yoshitaka
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of the author nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.

history-search-multi-word

@@ -111,6 +111,7 @@ _hsmw_main() {
 
     region_highlight=( "$(( offset + ${#txt_before} )) $(( offset + ${#txt_before} + ${#entry} + 1 )) underline" )
     if [ -n "$colsearch_pattern" ]; then
+        # Following line is taken from Zaw (GH zsh-users/zaw) – license is in LICENSE_zaw
         region_highlight+=( "${(f)${(S)text//*(#bi)(${~colsearch_pattern})/$(( offset + mbegin[1] - 1 )) $(( offset + mend[1] )) ${__hsmw_hl_color}${nl}}%$nl*}" )
     fi
 }